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#include <iostream>
#include <map>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    int n, x;
    string s;
    vector<int> qualified;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> s >> x;
        if (s == "NIE")
            continue;
        if (qualified.size() < 10) {
            qualified.push_back(i);
        } else {
            if (x < 2) {
                qualified.push_back(i);
            }
        }
    }
    for (int i = 0; i < 20; i++) {
        cout << qualified[i] << " ";
    }
    return 0;
}